CN108258148B - OLED display panel, driving method thereof and display device - Google Patents

OLED display panel, driving method thereof and display device Download PDF

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Publication number
CN108258148B
CN108258148B CN201810048777.3A CN201810048777A CN108258148B CN 108258148 B CN108258148 B CN 108258148B CN 201810048777 A CN201810048777 A CN 201810048777A CN 108258148 B CN108258148 B CN 108258148B
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Prior art keywords
driving circuit
pixel driving
block
electrode
display panel
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CN108258148A (en
Inventor
刘伟
董学
王海生
陈小川
丁小梁
刘英明
杨盛际
许睿
李昌峰
郑智仁
曹学友
王鹏鹏
韩艳玲
张平
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/82—Cathodes
    • H10K50/822—Cathodes characterised by their shape
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix

Abstract

The disclosure provides an OLED display panel, a driving method thereof and a display device, and belongs to the technical field of display. The OLED display panel includes: the array substrate comprises a first electrode layer, a second electrode layer, a light emitting layer and a pixel driving circuit, wherein the light emitting layer is positioned between the first electrode layer and the second electrode layer, the pixel driving circuit is electrically connected with the second electrode layer, the second electrode layer comprises a plurality of block electrodes which are arranged in a matrix form, and the area of the block electrodes close to the pixel driving circuit is smaller than the area of the block electrodes far away from the pixel driving circuit. By adopting differential design for the plurality of block electrodes, the area of the far-end block electrode is large, and the connection line width to the pixel drive circuit is wide; the area of the near-end block electrode is small, and the connecting line to the pixel driving circuit is narrow, so that the difference between the far end and the near end of the cathode caused by the division is reduced to the maximum extent, and the resistance of the connecting line from the far-end block electrode to the pixel driving circuit is close to that of the near-end block electrode.

Description

OLED display panel, driving method thereof and display device
Technical Field
The disclosure relates to the technical field of display, in particular to an OLED display panel, a driving method thereof and a display device.
Background
OLED (Organic Light Emitting Diode) is becoming an important development direction of display industry due to its advantages of low energy consumption, self-luminescence, wide viewing angle, fast response speed, and being capable of being folded.
Generally, in order to maximize the advantages of the OLED and make the OLED display more intelligent, the cathode of the OLED is patterned in the prior art, for example, the touch, pressure, and light sensing performances are integrated into the OLED, so as to realize a product with fine, high quality, and light weight. However, when the cathode is patterned, the resistance-capacitance mismatch at the far end and the near end of the display screen caused by patterning division is inevitably encountered, which leads to the deterioration of the display quality of the display screen and the shortening of the product life.
Therefore, there is still a need for improvement in the prior art solutions.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
An object of the present disclosure is to provide an OLED display panel, a method of driving the same, and a display device, thereby overcoming, at least to some extent, one or more of the problems due to the limitations and disadvantages of the related art.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be learned by practice of the disclosure.
According to an aspect of the present disclosure, there is provided an OLED display panel including:
a first electrode layer;
a second electrode layer;
a light emitting layer between the first electrode layer and the second electrode layer; and
the pixel driving circuit is electrically connected with the second electrode layer;
the second electrode layer comprises a plurality of block electrodes arranged in a matrix form, and the area of the block electrodes close to the pixel driving circuit is smaller than the area of the block electrodes far away from the pixel driving circuit.
In an exemplary embodiment of the present disclosure, further comprising:
and the connecting line is used for connecting the block electrode and the pixel driving circuit, and the width of the connecting line between the block electrode close to the pixel driving circuit and the pixel driving circuit is smaller than the width of the connecting line between the block electrode far away from the pixel driving circuit and the pixel driving circuit.
In an exemplary embodiment of the present disclosure, the plurality of block electrodes are arranged row by row from small to large according to a distance to the pixel driving circuit, and the length and width of the connection line from the block electrode to the pixel driving circuit in the same row are the same.
In an exemplary embodiment of the present disclosure, the pixel driving circuit supplies the reference voltages having the same value to the block electrodes in the same row through the connection lines.
In an exemplary embodiment of the present disclosure, the pixel driving circuit supplies a larger value of the reference voltage to the block electrode close to the pixel driving circuit than to the block electrode far from the pixel driving circuit.
In an exemplary embodiment of the present disclosure, the bulk electrodes located in the same column lead out the connection lines on the same side.
In one exemplary embodiment of the present disclosure, the connection lines of the block electrodes of a partial column among a plurality of columns of the block electrodes are led out in a direction opposite to the lead-out direction of the connection lines of the block electrodes of the remaining partial column.
According to a second aspect of the present disclosure, there is also provided a display device including the OLED display panel described above.
According to a third aspect of the present disclosure, there is also provided a driving method of an organic light emitting diode OLED display panel, for controlling the above-mentioned driving of the OLED display panel, including:
in the display stage, different reference voltages are respectively supplied to a plurality of block electrodes arranged in a matrix form in the second electrode according to the distribution of the rows.
In an exemplary embodiment of the present disclosure, the supplying of the different reference voltages to the plurality of block electrodes arranged in a matrix form in the cathode, respectively, in a distribution of rows includes:
acquiring a data lookup table of the OLED display panel, wherein the data lookup table records the resistance and the voltage drop of a far-end bulk electrode and a near-end bulk electrode of the OLED display panel;
and obtaining the reference voltage of the block electrode corresponding to each area of the picture to be displayed according to the mapping between the picture to be displayed and the data lookup table, wherein the value of the reference voltage provided to the block electrode close to the pixel driving circuit is larger than the value of the reference voltage provided to the block electrode far away from the pixel driving circuit.
According to the OLED display panel, the driving method thereof and the display device provided by some embodiments of the disclosure, on one hand, by adopting a differentiated design for the plurality of block electrodes, the area of the far-end block electrode is large, and the connection line width to the pixel driving circuit is wide; the area of the near-end block electrode is small, and the connecting line to the pixel driving circuit is narrow, so that the difference between the far end and the near end of the cathode caused by segmentation is reduced to the maximum extent, and the resistance of the connecting line from the far-end block electrode to the pixel driving circuit is close to the resistance of the connecting line from the near-end block electrode to the pixel driving circuit; on the other hand, in the display stage, different reference voltages are respectively provided to a plurality of block electrodes according to the distribution of rows, the voltage values output to the block electrodes by a pixel driving circuit in the display period are the same through compensation, and the voltage loss difference caused by the impedance difference of connecting wires after division is compensated, so that the problem of uneven display image quality caused by the inconsistent voltage difference of the far-end and near-end block electrodes after cathode division is solved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 is a schematic diagram illustrating a conventional dividing and routing manner when patterning an OLED according to an embodiment of the present disclosure.
Fig. 2 shows a schematic structural diagram of an OLED display panel provided in an embodiment of the present disclosure.
Fig. 3 shows a circuit diagram of a typical 2T1C pixel driving circuit in an embodiment of the disclosure.
Fig. 4 shows a schematic distribution of a plurality of bulk electrodes in the cathode of fig. 2 in an embodiment of the disclosure.
Fig. 5 shows a flowchart of a driving method of an OLED display panel provided in another embodiment of the present disclosure.
FIG. 6 is a schematic diagram illustrating a reference voltage provided to the plurality of bulk electrodes shown in FIG. 4 in another embodiment of the present disclosure.
Fig. 7 shows waveforms of reference voltages respectively supplied to the distal and proximal block electrodes in another embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
In this document, the directional terms "inner side" and "outer side" refer to the side facing the liquid crystal layer and the side facing away from the liquid crystal layer, respectively, for example, the inner side of the substrate refers to a layer of the substrate facing the liquid crystal layer. In addition, the directional terms "upper", "lower", "left" and "right" are defined with respect to the schematically placed orientations of the display device in the drawings. It will be appreciated that the above directional terms are relative concepts that are used for descriptive and clarity purposes relative to each other and that may vary accordingly depending on the orientation in which the display device is placed.
In the related embodiment of the present disclosure, when sensing functions such as touch, pressure, and light are integrated in the OLED, patterning of the OLED is performed to achieve high definition, high quality, and light and thin of the product. FIG. 1 illustrates a conventional split routing method for OLED patterningIn the schematic diagram, as shown in fig. 1, when patterning the cathode of the OLED, a uniform dividing process is adopted, that is, the size of each block electrode 01 is equal, and the width of the trace 02 from each block electrode (whether the far end block electrode or the near end block electrode) to the pixel driving Circuit (Integrated Circuit) (not shown in fig. 1) is also uniform, which easily results in the impedance Z of the near end block electrode (i.e., the block electrode with shorter trace with the pixel driving Circuit)Proximal endThe impedance Z of the small, but far-end block electrode (i.e. the block electrode with longer wiring between the pixel drive circuit)Distal endThe voltage difference between the anode end of the OLED device corresponding to the near-end block electrode is small, the display brightness is high, the voltage drop of the anode end of the OLED device corresponding to the far-end block electrode is large, the display brightness is low, the display image quality is uneven, and the service life of the screen is affected due to the fact that the display image quality is uneven for a long time.
It should be noted that, if the touch function is integrated in the OLED, the block-shaped electrodes herein may correspond to the touch units; if the pressure sensing function is integrated in the OLED, the block electrode can correspond to the voltage control unit; the block electrodes here may correspond to the light sensitive cells if the light sensitive function is integrated in the OLED.
Based on the problems, the present disclosure provides a display device capable of solving the problem of uneven screen display caused by inconsistent near and far voltages due to OLED cathode division.
Fig. 2 shows a schematic structural diagram of an OLED display panel provided in the present disclosure, and as shown in fig. 2, the OLED display panel includes: the organic light emitting diode comprises a first electrode layer 21, a second electrode layer 22 and a light emitting layer 23 positioned between the first electrode layer 21 and the second electrode layer 22, wherein the light emitting layer 23 sequentially comprises a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer and an electron injection layer, the hole injection layer is adjacent to an anode, and the electron injection layer is adjacent to a cathode.
In an embodiment of the present invention, the first electrode layer 21 may be an anode, and the second electrode layer 11 may be a cathode. In another embodiment of the present invention, the first electrode layer is hereinafter described as an anode and the second electrode layer is hereinafter described as a cathode in this embodiment, and therefore the anode 21 and the cathode 22 are hereinafter described.
As shown in fig. 2, the OLED display panel further includes a substrate 24, and the anode 21 is formed on the substrate 24, where the substrate 24 is also flexible and may also be rigid, and may be selected according to specific requirements.
In addition, the OLED display panel further includes a pixel driving circuit (not shown in the figure) for providing corresponding voltages to the anode 21 and the cathode 22 of the OLED light emitting device during the display period, so as to provide a condition for continuous lighting of the OLED. In addition, a peripheral driving circuit (generally, simplified to be a driving circuit) is further included in the OLED display panel, and when the row and column scanning is enabled, a corresponding scanning signal and a data signal are input to each pixel in the OLED display panel to implement writing of gray scale data, and the peripheral driving circuit is not limited and described herein.
Fig. 3 shows a circuit diagram of a typical 2T1C pixel driving circuit, as shown in fig. 3, the driving circuit includes a switching transistor M1, a driving transistor M2, a storage capacitor C and an OLED (Organic Light Emitting Diode), the gate of the switching transistor M1 is connected to the scan line SW, the drain of the switching transistor M1 is respectively connected to the data line Vdata, the source of the switching transistor M1 is connected to the gate of the driving transistor M2, two ends of the storage capacitor C are connected between the gate of the driving transistor M2 and the source of the driving transistor M2, the source of the driving transistor M2 is connected to the first power source ELVDD, the drain of the driving transistor M2 is connected to the anode of the OLED, and the cathode of the OLED is connected to the second power source ELVSS.
It should be noted that the pixel driving circuit shown in fig. 3 is only an example, and in a specific circuit design, the structure of the driving circuit may be modified as required as long as the first power source ELVDD supplies a first power voltage to the anode through the driving transistor M2, the second power source ELVSS is connected to the cathode, and supplies a second power voltage to the cathode, where the second power voltage is a reference voltage, so as to enable the corresponding OLED light emitting device to perform image display.
In the present embodiment, the cathode 22 is divided into a plurality of block electrodes by patterning the cathode 22, and functions such as touch, pressure, and light are integrated into the block electrodes of the cathode 22. The structure shown in fig. 2 illustrates an OLED touch display panel as an example, in-cell (in-cell) touch structure is adopted, and the cathode 22 therein is divided and reused as a touch electrode, so that the cathode 22 is used as a common electrode in the display stage; in the touch stage, the cathode 22 is reused as a touch electrode, and an insulating layer 25 is disposed on the touch electrode (i.e., the cathode 22) to protect the OLED display device.
Fig. 4 shows a distribution diagram of a plurality of block electrodes in the cathode of fig. 2, as shown in fig. 4, wherein the cathode 22 includes a plurality of block electrodes 01 arranged in a matrix form, the plurality of block electrodes are arranged row by row from small to large according to the distance to the pixel driving circuit, and the area of the block electrode close to the pixel driving circuit is smaller than that of the block electrode far from the pixel driving circuit.
In addition, as shown in fig. 4, the OLED display panel further includes a connecting line for connecting the block electrode and the pixel driving circuit shown in fig. 3, and the length and width of the connecting line from the block electrode in the same row to the pixel driving circuit are the same, and the length and width of the connecting line from the block electrode in different rows to the pixel driving circuit are also different, that is, the width of the connecting line between the block electrode close to the pixel driving circuit and the pixel driving circuit is smaller than the width of the connecting line between the block electrode far from the pixel driving circuit and the pixel driving circuit.
In fig. 4, the division of the cathode will be schematically described by taking only 3 rows and 4 columns of block electrodes as an example. The block-shaped electrode in the row 1 is a far-end block-shaped electrode far away from the pixel driving circuit, the area is large, and the connecting wire is wide; the block electrodes in the row 2 are near-end block electrodes which are close to the pixel driving circuit, the area is smaller, and the connecting line is narrower; the 3 rd row of block electrodes are near-end block electrodes which are closer to the pixel driving circuit, the area is smaller, and the connecting lines are narrower. The width of the connecting line becomes smaller as the length of the connecting line becomes shorter, and the connecting line between the block electrode close to the pixel driving circuit and the pixel driving circuit is shorter and the connecting line between the block electrode far from the pixel driving circuit and the pixel driving circuit is longer.
According to the resistance calculation formula, R is Rs L/W, wherein Rs is the block resistance of the cathode material, W is the width of the connecting line from each block electrode to the pixel driving circuit, and L is the length of the connecting line from each block electrode to the pixel driving circuit. The areas of the block electrodes in fig. 2 are equal, and if the widths of the connection lines from the block electrodes to the pixel driving circuit are the same, the resistance increases as the length of the connection lines becomes longer, so that the resistance of the connection lines from the far-end block electrodes to the pixel driving circuit and the resistance of the connection lines from the near-end block electrodes to the pixel driving circuit are significantly different.
According to the embodiment of the invention, the plurality of block electrodes are designed in a differentiated mode, according to the resistance calculation formula, the area of the far-end block electrode is large, and the connecting line from the far-end block electrode to the pixel driving circuit is longer, so that the connecting line is wider; the area of the near-end block electrode is small, the length of a connecting line to the pixel driving circuit is shorter, and the connecting line needs to be designed to be narrower, so that the resistance of the connecting line from the far-end block electrode to the pixel driving circuit is close to the resistance of the connecting line from the near-end block electrode to the pixel driving circuit, and the difference between the far end and the near end of the cathode caused by segmentation is reduced to the maximum extent.
Referring to fig. 4, the connection lines from the bulk electrodes to the pixel driving circuits may be designed in the following manner: the connecting lines are led out from the block electrodes in the same column on the same side, and as shown in fig. 4, the connecting lines from the block electrodes in the 1 st column to the pixel driving circuit are all arranged on the right side of the block electrodes in the 1 st column.
Furthermore, the connection lines of the block electrodes in a part of the columns of the plurality of columns of block electrodes are led out in the opposite direction to the connection lines of the block electrodes in the remaining part of the columns, for example, the connection lines of the plurality of columns of block electrodes may be led out from the opposite sides of the block electrodes symmetrically with respect to the center line of the OLED display panel, but may be asymmetric in other embodiments. As shown in fig. 4, the connection lines from the block electrodes of the 1 st and 2 nd columns to the pixel driving circuits are arranged on the right side of the column of block electrodes, and the connection lines from the block electrodes of the 3 rd and 4 th columns to the pixel driving circuits are arranged on the left side of the column of block electrodes, so that the left and right frames of the OLED display panel can be symmetrical.
It should be noted that fig. 4 only shows the case of using 4 columns of block electrodes as an example, in an actual design, if more columns and more rows of block electrodes are included in the OLED display panel, the width of the connection line from each block electrode to the pixel driving circuit may gradually change in units of rows, and the block electrodes in each column may be symmetrically distributed about the center line of the OLED display panel.
In an embodiment of the invention, in the display stage, the pixel driving circuit provides the reference voltage to the block electrodes through the connection lines, and the pixel driving circuit provides the reference voltages with the same value to the block electrodes in the same row through the connection lines and provides the reference voltages with different values to the block electrodes in different rows. In the present embodiment, a grouped power supply manner is adopted for the divided block electrodes instead of providing the same reference voltage, different reference voltages are provided according to the difference between the near and far block electrodes, the voltage values output to the block electrodes by the pixel driving circuit during the display period are made the same by compensation, and the voltage loss difference caused by the impedance difference between the divided connecting wires is compensated, so as to solve the problem of uneven display image quality caused by the inconsistent voltage difference between the near and far block electrodes after the cathode division as shown in fig. 2.
Since the first power voltage of the first power ELVDD is applied to the anode of the OLED and the second power voltage (i.e., the reference voltage) of the second power ELVSS is applied to the cathode of the OLED during the display of each OLED device in the display stage, the first power voltage and the reference voltage form a voltage difference across the OLED device, thereby generating a current flowing through the OLED device to drive the OLED device to emit light. Since the voltage applied to the anode of the OLED by the first power source ELVDD in the actual circuit may generate a voltage drop, that is, the voltage drop is different from the voltage input by the first power source ELVDD, and the voltage drop of the OLED at the far end and the near end is different from the voltage input by the driving circuit, the embodiment of the invention can solve the problem of non-uniformity of the display screen of the OLED display panel by correspondingly adjusting the second power source ELVSS input to the cathode of the OLED according to the voltage drop of the first power source ELVDD at the anode of the OLED.
It should be noted that, the OLED display panel in this embodiment may be an OLED touch display panel shown in fig. 2, and may also be an OLED voltage-controlled display panel or an OLED light-sensitive display panel, that is, the pressure-sensitive function and the light-sensitive function are respectively integrated into the cathode of the OLED, the principle and the structure are similar to those in fig. 1 and the above-mentioned embodiment, and details are not repeated here.
According to the OLED display panel provided by some embodiments of the present disclosure, on one hand, by adopting a differentiated design for the plurality of block-shaped electrodes, the area of the far-end block-shaped electrode is large, and the line width of the connection to the pixel driving circuit is wide; the area of the near-end block electrode is small, and the connecting line to the pixel driving circuit is narrow, so that the difference between the far end and the near end of the cathode caused by segmentation is reduced to the maximum extent, and the resistance of the connecting line from the far-end block electrode to the pixel driving circuit is close to the resistance of the connecting line from the near-end block electrode to the pixel driving circuit; on the other hand, in the display stage, different reference voltages are respectively provided to a plurality of block electrodes according to the distribution of rows, the voltage values output to the block electrodes by a pixel driving circuit in the display period are the same through compensation, and the voltage loss difference caused by the impedance difference of connecting wires after division is compensated, so that the problem of uneven display image quality caused by the inconsistent voltage difference of the far-end and near-end block electrodes after cathode division is solved.
Another embodiment of the present invention further provides a driving method for an OLED display panel, for controlling the driving of the OLED display panel provided in the above embodiments, which is different from the conventional driving method in that the same reference voltage is provided to each block electrode, and the driving method includes: in the display stage, different reference voltages are respectively supplied to a plurality of block electrodes arranged in a matrix form in the second electrode, which may be a cathode, in a distribution of rows.
Fig. 5 is a flowchart illustrating a driving method of the OLED display panel, which is described above.
As shown in fig. 5, in step S51, a screen to be displayed is received.
As shown in fig. 5, in step S52, a data lookup table is acquired. For each OLED display panel, data such as resistance difference (namely impedance difference) and voltage drop of the far end and the near end of the OLED display panel are recorded through factory test to form a database, namely a data lookup table, so that the resistance and the voltage drop of the far end block electrode and the near end block electrode of the OLED display panel are recorded in the data lookup table.
As shown in fig. 5, in step S53, the reference voltages of the block electrodes corresponding to the respective areas of the picture to be displayed are obtained according to the mapping between the picture to be displayed and the data lookup table. The value of the reference voltage supplied to the block electrode close to the pixel driving circuit is larger than the value of the reference voltage supplied to the block electrode far from the pixel driving circuit.
As shown in fig. 5, in step S54, data processing is performed according to the reference voltages corresponding to the distal block electrode and the proximal block electrode, that is, different reference voltages are supplied to the distal block electrode and the proximal block electrode, respectively, and display data for each row of block electrodes is output in groups.
As shown in fig. 5, in step S55, the display data is transmitted to the corresponding block electrodes through the data lines to implement differential compensation for each block electrode of the cathode, so that the voltage values output to the block electrodes by the pixel driving circuit during the display period are the same.
Fig. 6 is a schematic diagram illustrating a reference voltage supplied to the plurality of block electrodes shown in fig. 4, and as shown in fig. 6, the voltage ELVSS1 supplied by the second power source is supplied to the block electrodes of row 1, the voltage ELVSS2 supplied by the second power source is supplied to the block electrodes of row 2, and the voltage ELVSS3 supplied by the second power source is supplied to the block electrodes of row 1, that is, different second power source voltages (i.e., reference voltages) are supplied according to the distribution of rows, respectively.
Fig. 7 shows waveforms of the second power voltage (i.e. the reference voltage) respectively provided to the far-end block electrode and the near-end block electrode in step S54, still taking the integration of the touch function into the cathode as an example, as shown in fig. 7, where EN is an enable signal, when the OLED display panel displays each frame, the OLED display panel includes a display phase T1 and a touch phase T2, specifically: when EN is high level, the OLED display panel is in a display stage; when the EN is at a low level, the OLED display panel is in a touch stage.
As shown in fig. 7, in the touch stage, a touch scan signal is input to the cathode of the OLED display panel shown in fig. 2, so as to determine the touch position.
As shown in fig. 7, in the display phase, the first power ELVDD inputs a voltage to the anode of the OLED display panel shown in fig. 2, and the second power ELVSS inputs a voltage to the cathode, and as shown in fig. 7, the voltages provided by the second power ELVSS to the row 1 block-shaped electrode (i.e., the far-end block-shaped electrode), the row 2 block-shaped electrode, and the row 3 block-shaped electrode (i.e., the near-end block-shaped electrode) are ELVSS1, ELVSS2, and ELVSS3, respectively, that is, the voltage values provided by the second power are sequentially increased to compensate for the voltage loss difference caused by the impedance difference of the connecting wires after the cathode is divided, so that the display panel achieves uniform display, the problem of non-uniform display screen due to the impedance difference between the far end and the near end is solved, and the service life of the OLED display panel.
In the method for driving the OLED display panel according to some embodiments of the present disclosure, different reference voltages are respectively provided to the plurality of block electrodes according to the distribution of rows in the display stage, so that the voltage values output to the block electrodes by the pixel driving circuit during the display period are the same through compensation, and the voltage loss difference caused by the impedance difference of the connecting lines after the division is compensated, so as to solve the problem of uneven display image quality due to the inconsistent voltage differences between the near and far end block electrodes after the cathode division.
The embodiment of the invention also provides a display device, which comprises the OLED display panel in the embodiment, and has the same structure and beneficial effects as the embodiment. Since the foregoing embodiments have described the structure and beneficial effects of the OLED display panel in detail, no further description is provided herein.
In addition, the display device may be: any product or component with a display function, such as a display panel, electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
It should be clearly understood that this disclosure describes how to make and use particular examples, but the principles of this disclosure are not limited to any details of these examples. Rather, these principles can be applied to many other embodiments based on the teachings of the present disclosure.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (9)

1. An Organic Light Emitting Diode (OLED) display panel, comprising:
a first electrode layer;
a second electrode layer;
a light emitting layer between the first electrode layer and the second electrode layer;
the pixel driving circuit is electrically connected with the second electrode layer; wherein the second electrode layer comprises a plurality of block electrodes arranged in a matrix form, and an area of the block electrode close to the pixel driving circuit is smaller than an area of the block electrode far from the pixel driving circuit; and
the connecting wire is used for connecting the block electrodes and the pixel driving circuit, and the pixel driving circuit provides reference voltages with different values to the block electrodes in different rows through the connecting wire; the width of a connecting line between the block electrode close to the pixel driving circuit and the pixel driving circuit is smaller than the width of a connecting line between the block electrode far from the pixel driving circuit and the pixel driving circuit.
2. The OLED display panel according to claim 1, wherein the plurality of block electrodes are arranged row by row from small to large according to a distance to the pixel driving circuit, and the length and width of the connection line from the block electrode to the pixel driving circuit in the same row are the same.
3. The OLED display panel of claim 1, wherein the pixel driving circuit supplies reference voltages of the same value to the block electrodes in the same row through the connection lines.
4. The OLED display panel of claim 1, wherein the pixel driving circuit provides a greater value of the reference voltage to the bulk electrode closer to the pixel driving circuit than to the bulk electrode further from the pixel driving circuit.
5. The OLED display panel of claim 1, wherein the bulk electrodes in the same column exit the connecting lines on the same side.
6. The OLED display panel according to claim 5, wherein the connection lines of the block electrodes of a part of the columns among the plurality of columns of block electrodes are led out in a direction opposite to the direction in which the connection lines of the block electrodes of the remaining part of the columns are led out.
7. A display device comprising the OLED display panel according to any one of claims 1 to 6.
8. A driving method of an Organic Light Emitting Diode (OLED) display panel for controlling the driving of the OLED display panel according to any one of claims 1 to 6, comprising:
in the display stage, different reference voltages are respectively supplied to a plurality of block electrodes arranged in a matrix form in the second electrode according to the distribution of the rows.
9. The method of driving the OLED display panel according to claim 8, wherein the supplying of the different reference voltages to the plurality of block electrodes arranged in the matrix form among the second electrodes respectively in the distribution of the rows includes:
acquiring a data lookup table of the OLED display panel, wherein the data lookup table records the resistance and the voltage drop of a far-end bulk electrode and a near-end bulk electrode of the OLED display panel;
and obtaining the reference voltage of the block electrode corresponding to each area of the picture to be displayed according to the mapping between the picture to be displayed and the data lookup table, wherein the value of the reference voltage provided to the block electrode close to the pixel driving circuit is larger than the value of the reference voltage provided to the block electrode far away from the pixel driving circuit.
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